Rotary drill



R. ALLISON.

ROTARY DRILL.

(No Model.)

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UNITED STATES PATENT OFFICE.

ROBERT ALLISON, OF PORT CARBON, PENNSYLVANIA.

ROTARY DRILL.

SPECIFICATION forming part of Letters Patent No. 261,978, dated August1, 1882.

Application filed May 4, 1882., (No model.)

To all whom it may concern:

Be it known that I, ROBERT ALLISON, of

the town of Port Carbon, in the county of Schuylkill and State ofPennsylvania, have invented a new and useful Improvement in R0- taryDrills; and I do hereby declare the following to be a full, clear, andexact description of the invention, which will enable others skilled inthe art to which it appertains to make and use my invention, referencebeing had to the accompanying drawings, which form apart of thisspecification, and in which- Figure 1 is a side view of my invention inone form; Fig. 2, an axial section thereof; Fig. 3, an axial section ofa modification thereof. Fig.4 shows my invention applied to twocylinders as patented by me December 23, 1873.

This improvement relates to that class of rock-boring machines whichoperate by rotation and continued PIGSSllIB-rStlOl], for instance, asthe Leschot or diamond drill; and it consists in the combination of asingle hydraulic cylinder with a revolving drill-rod, or a drill-spindlecarrying the drill-rod when, as hereinafter set forth, a spindle isused, the rod or the spindle, when one is used, being connected to apiston which is made to move in either direction through the cylinder bywater or other pressure on the piston, the water being preferablycontrolled and directed by a four-way cock.

The simplest form of my invention is represented in Figs. 1 and 2, inwhich A is a cylinder containing a piston, B, to which is attached thedrill-rod O, armed with a boring head or site end of the cylinder Athrough a pipe, L,

which communicates with the passage M.

In the operation of the machine, the cock F cook or increased again byopening it. The

necessity for such adjustment may be indicated by a pressure-gageconnected with the cylinder, so as to show the pressure on the drill,and the drill may be withdrawn by reversing the cock,.which will connectthe adjacent end of the cylinder with the waste-pipe and the forward endwith the feed-pipe;

The drill-rod is furnished at the point where it is connected with thepiston with the collar or, (seen in Fig. 2,) which rotates in arecess inthe piston, so that the rod can be rotated without compelling therotation of the piston. A suitable lubricating device, many of which arenow well known, should be used at this point, which will lubricate itfor a comparatively long period.

The above-described form of apparatus, in which the drill-rod is thepiston-rod, is not adapted to boring to a depth greater than about thelength of the cylinder.

To enable the drill to be fed by hydraulic pressure while boring to anydepth required, I employthe modification shown in Fig. 3, in which B isa hollow piston-rod or spindle projecting through a stuffing-box at eachend of the cylinder A, and rotated by gear E. The drill-rod 0 passesthrough this rod B, to which 'it is secured by a chuck, N. When thedrill has descended far enough to require more length of rod the chuckis loosened and another section coupled to the drill-rod, and fastenedto the piston-rod by the chuck, and in this way the drill may be made tobore to any depth required, and be fed or withdrawn in the manner abovedescribed. The piston-rod is also in this case furnished with thecollars b 11. (Seen in Fig. 3.) One or more may be used, which alsorotate in recesses provided for them in the piston, and they arelubricated in the same way as before stated.

Pneumatic pressuresuch as that of steam, condensed air, or other gas orvapor-may be employed in this apparatus, instead of hydraulic pressure,to feed the drill.

I have described this invention as applicable to drilling and boring inrock; but it is also applicable to drilling metals and other substancesfor which a continuously-revolving and gradually-progressing drill isused.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In a rotary drill, the combination of the driving mechanism, acylinder and piston, a hollow rotary rod passing through the piston andextending beyond the ends of the cylinder, and so attached to the pistonthat it receives longitudinal motion from it, a drill-rod held by thehollow rotary rod, and a founway cock, substantially as and for thepurposes set forth.

2. In a rotary drill, the combination of the driving mechanism, acylinder and piston, a hollow rotary rod passing through the piston andextending beyond the ends of the oylin- 2o der, and so attached to thepiston'that it receives longitudinal motion from it, and a drillrod heldby the hollow rotary rod, as and for the purposes set forth.

3. The combination, in a rotary drill, of a 25 cylinder and piston, ahollow rotary rod pass ing through the cylinder and through the piston,and which receives its longitudinal motion from the piston, a clutch onthe hollow rotary rod, mechanism for rotating this rod, and a 0drill-rod fastened to the hollow rotary rod by the clutch, substantiallyas and for the purposes set forth.

ROBT. ALLISON.

Witnesses:

A. (J. EDMoNDs, OnAs. H. WoLTJeN.

